Description:
The Media playback icon does not function properly in an odt file (which was once a pptx file converted to odt, media playback just does not work on a pptx file but pptx support is a bigger problem that I know y'all are working hard on). The icon is invisible and only appears once it is moved which the easiest way to do is selecting everything, moving everything and then clicking undo. This problem is seen on the editing screen, when presenting the media icon appears as normal even if it is invisible on the editing screen. 

Steps to Reproduce:
1. Download odt file with media playback 
1a. It may have to be a pptx file that was converted to odt in libreoffice
2. Media playback icons should be gone (except for first slide)
3. Move media playback icon (or just move everything) for it to reappear.

Actual Results:
The media playback icon first is disapeared and then it reappears

Expected Results:
7.0.0.3


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
Version: 7.0.0.3
Build ID: 8061b3e9204bef6b321a21033174034a5e2ea88e
CPU threads: 4; OS: Mac OS X 10.14.6; UI render: default; VCL: osx
Locale: en-US (en_US.UTF-8); UI: en-US
Calc: threaded